Thermostat.



'L. L. GLAXTON.

THERMOSTAT. I APPLICATION FILED 1130.13, 1907.

Patented Mar. 14, 1911.

WITNESSES.-

5 W By W A TTORNEV.

. ferent metals, which movement is "bars.

LOUIS L. ona'xa'on, or rn'rnnson, new JERSEY.

'rnnnmosram.

Specification of Letters Patent. Patented Mar, 14, 1911. Application filed December-13, wot. serial No;

To all whom it may concern:

Be it known that I, LOUIS *GLAXTON, a citizen of the UnitedSta'tes, and resident of Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Thermostats, of which the following is a specification.

This invention relates to a mechanical device for the'controlling of heat in incubators and broo'ders and also for the operating of valves or devices by means of which heat is controlled.

.The object of this invention is to secure a greater movement than any other similar device known, this increase of movement is secured by takin advantage of the difference in the co-e cient of expansion of difgreatly increased by compelling same to take a radial course around the center point of the bar having the lesser expansion instead of permitting same to move ina perpendicular direction through points at each end which would greatly reducethe movement, all of which is more particularly described and claimed below.

forming a part of this specification, Figure 1 is a front view of my invention. Fig. 2 shows the radial action of the thermostat and its position on an increased degree of heat.- Fig. 3 is a cross section through the center on a line of rod 6 of Fig. 1. Fig. 4 is a detail of the upper bar. Fig. 5 is an end view of a cross section made beside the rivet i at the end of the bars. Fig. 6 is a detail of the two lower In the drawings connected for the purpose of increasing the length of movement.

' action will be lengthwise i All the points In the drawings, similar letters refer to similar parts throughout the several views. In the drawing a bar a and d of metal are representedas being the most sensitive to the action of heat, and the intermediate bar 0 as one the least sensitive to heat. The

plate with flanged from curving when expanding, so that the the bar, and has its flanges cut out at points indicated by b on each side at its'center 'and near its ends; this is so that the web or fiat portion can bend when necessary, and act as a hinge. of cutting the flanges are not necessarily cut out where indicated, but may be at other points in the flanges where found Fig. 7 shows a number of devices necessary. The intermediate bar 0 is also made of similar construction as the bars a and cl except as to cutting flanges but consists of some metal which is less expansive when heated, the three are secured at their ends to each other by rivets '5, these rivets are inserted between the extreme ends and the places where the' flanges are cut as shown in Fig. 1. The intermediate bar 0 and the bar d are rigidly secured between their ends, the bar a lying in closer imity to the bar d than to the bar a, the fastening is made by means of the piece h, through which the rivets i also pass. This bar c can be attached to a with the sameresults instead of the bar d. The intermediate bar 0 having the lesser expansion can either be straight or bowed toward the bar to which it is strapped at the center. The bars which are strapped at their center are secured with plates 8 and m above and below inaddition to the piece h, with rivets, the single bar also has a piece 8 below it at the center secured with rivets, to make them more rigid. The part f is secured to the upper bar by means of rivets and in this is secured a pipe or tube g, and through this pipe the rod 0 passes freely, it is by means of this pipe 9 that the instrument is held in position. The rod 6 passes freely through the upper bar and fittings, also through the flat strap 8 on the top bar, bar 0, through the bar 0 the piece It and the bar d, and in the platet-apped which receives the threaded lower endl of the rod 0 in this piece :20 is the only connection between the rod 6 and the device. There is also a lock nut'm screwed on the threaded end Z of the rod 6 to secure it in an adjusted position. In each bar the flanges must be so that they will not rub, that is the outside one is the widest bar and the others fit freely between the flanges as shown in Fi 5 In more fu ly describing the movementof bars a and d and owhen expanded. The line y' 0 is a perpendicular line through the center of the device and o is the point of intera: there is a thread proxsection of the lines 0 2 Which is the line of I comprising three bars having their ends the bar 03 in an expanded position in the 5 joined to ether, the intermediate bar having perpendicular 0 j, 0 is therefore the extreme a less coe icient of expansion than the outer ottom point of the device when expanded. bars, said intermediate bar being ri idly se- 5 By colnpellinv bar a to expand around to I cured between its ends to one of said outer 20 the center of ar 0, Which has a lesser exbars and lying in closer proximity thereto pension than the bar a, it Will draw the than to the other outer bar as set forth and extreme ends of the device closer together described.

and at the same time produce an increased Signed at Paterson in the county of Pas- I 10 downward movement. I saw and State of NeW Jersey this 26th day 25 Having thus described my'invention What of Nov. A. D1907. I claim and desire to secure by Letters Pat- LOUIS L. CLAXTON. ent is Witnesses:

A compound thermostat adapted to trans- 2 ROBERT D. BUCKLEY, 1.5 mit motion radially with respect thereto, 1 ROBERT H. EDMOND. 

